Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e6058dfe2079cd3…

MALICIOUS

PDF

81.4 KB Created: 2021-09-20 19:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 105d220127306b9e199e01a382278c52 SHA-1: b5d086f4d7c8b28e0873b44729d1178c92776427 SHA-256: 0e6058dfe2079cd3bb0a4eff15f49d10593f83ef4c24677995a303176a086844
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple unknown URLs, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent. The presence of numerous links suggests an attempt to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cauthinh.com/luutru/files/50188368412.pdf In PDF document text
    • http://goldstecq.com/userfiles/file/bufukom.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///wowubajila.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140fa4ec14ca---70306977771.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/55847862505.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/lemotagudolabiserolip.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ce7c11d42---tirokokujijijobosaber.pdfIn PDF document text
    • http://gerocuki.hu/user/file/48910886618.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/popitekubisadukalifu.pdfIn PDF document text
    • https://fishuntpesca.it/file/48011768462.pdfIn PDF document text
    • https://invision.buzyhub.com/files/2945426326.pdfIn PDF document text
    • https://papiratisk.cz/soubory/berusalemugelovevutuwe.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/gixer.pdfIn PDF document text
    • http://gr-chem.com/upload/files/80122875050.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/3141925929.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/sunufemalekokinodakenigo.pdfIn PDF document text
    • https://tomas-music.com/contents/files/80607405092.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/3307825762.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161402cce2a425---31468707804.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/202191035693542.pdfIn PDF document text
    • http://salt17.com/userfiles/files/sulidopomilixodozeze.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/a16c0a984d073f2240836c5edc2ba329/midamizenutoxojasi.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/bujomubeviselusojowuziter.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/nedarugudir.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/suzererixelowavu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=download+moviebox+proPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB03 17252 bytes
SHA-256: 8dbacce3f06c9fce66eb34eb635e944e25ae5af7f3a5964079da625081041770
font_01_sfnt_off000107c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDB 10680 bytes
SHA-256: d2e3a0db7c1525d3d0b959c9a99199d1b52d5687fc3494c7e05712abbca25b77